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13 Possible Causes for Focal EEG Attenuation

  • Stroke

    Focal attenuation - Attenuation indicates reduced amplitude of one type of activity that occurs at certain frequency, or of the entire EEG activity.[] focal abnormalities 34.[] Attenuation generally indicates focal cortical lesion or reversible cortical dysfunction (post-ictal state, for example), but may be related to the presence of a collection[]

  • Subdural Hematoma

    Chronic subdural hematoma (CSDH) is prevalent among elderly populations worldwide, and its mysterious pathogenesis has been discussed in the literature for decades. The issues remaining to be solved in regard to CSDH include the initiating events; the bleeding into the subdural space and the formation of the outer[…][]

  • Postictal State

    The postictal state is defined as an abnormal state at the end of an epileptic seizure and it is characterized by motor, behavioral and neuropsychological symptoms. Depending on the type of seizure and other factors, the postictal state may last from minutes to hours, which is why the diagnosis is based on[…][]

  • Subdural Empyema

    Subdural empyaema is a form of empyema in the subdural space. Bacterial or occasionally fungal infection of the skull bones or air sinuses can spread to the subdural space, producing a subdural empyema. The underlying arachnoid and subarachnoid spaces are usually unaffected, but a large subdural empyema may[…][]

  • Uncinate Seizure

    , focal attenuation or rhythmic theta or delta is the prominent rhythm, and 10% of the abnormalities are focal fast activity like our case.[] […] recordings of NFLE show striking stereotypy between attacks. 7 Ictal EEG shows no epileptiform activity in almost 50%; in the majority of those that do show abnormalities[] NFLE is predominant in males and usually begins during adolescence. 9 NFLE patients experience many brief events in one night, usually in the space of a few hours. 10 Video-EEG[]

  • Stupor

    EEGs in the former may show focal disturbances such as delta and theta activity, epileptiform abnormalities, and attenuation of faster frequencies.[] In infratentorial lesions, the EEG may appear normal, particularly with a pontine lesion.[]

  • Panayiotopoulos Syndrome

    […] paroxysms that attenuate when eyes are opened.[] Prevalence is estimated at 0.2-0.9% of epilepsies, and 2-7% of benign childhood focal seizures.[] […] hallucinations, illusions or amaurosis, followed by hemiclonic seizures while awake, postictal migraine headaches, mean age at onset of 8.9 years, and interictal occipital spike-wave EEG[]

  • Photosensitive Epilepsy

    The ictal EEG of patient 7 showed generalized voltage attenuation lasting for 30 seconds without definite focal triggering discharges.[] Conversely, if they were recognized as PGTCS, the asymmetric presentations in patient 7 were evidences of focal onset, though the EEG showed generalized voltage attenuation[] […] and no focal clinical presentations was observed.[]

  • Ischemic Stroke

    Abstract This study investigated the effectiveness of neuromuscular electrical stimulation (NMES) for patients with wrist dysfunction after acute ischemic stroke (AIS).A total of 82 patient cases with wrist dysfunction after AIS were selected in this study. Of these, 41 cases in the intervention group received[…][]

  • Sturge-Weber Syndrome

    Background The background EEG may be normal, or may show focal slowing or attenuation over the region of the leptomeningeal angioma.[]

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